New Quick Filter Toolbar lets you filter against search terms, tags, starred messages, address book contacts, new emails, and attachments.

User Experience Improvements

New Migration Assistant

The new Migration Assistant gives Thunderbird 2 users a way to choose the new features in Thunderbird 3.1 or to keep their current features and settings.

Saved Files Manager

New Saved Files Manager displays all the files you downloaded from your email to your computer.

Mail Account Setup Wizard

Hundreds of ISP settings have been added to make setting up Thunderbird easier. The Mail Account Setup Wizard matches against a database of email settings from popular mail providers so that you will only need to provide your name, email, and password to set up new mail accounts.

OldVersion.com Points System

When you upload software to oldversion.com you get rewarded by points. For every field that is filled out correctly, points will be
rewarded, some fields are optional but the more you provide the more you will get rewarded!